Which of the following pairs of nuclei repres | vedclass

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(A) Isotones are nuclei that have the same number of neutrons $(N)$.The number of neutrons is calculated as $N = A - Z$,where $A$ is the mass number a

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$_{34}Se^{74}, _{31}Ga^{71}$

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(A) Isotones are nuclei that have the same number of neutrons $(N)$.The number of neutrons is calculated as $N = A - Z$,where $A$ is the mass number and $Z$ is the atomic number.For option $A$: $_{34}Se^{74} \implies N = 74 - 34 = 40$; $_{31}Ga^{71} \implies N = 71 - 31 = 40$.Since both nuclei have $40$ neutrons,they are isotones.For option $B$: $_{42}Mo^{92} \implies N = 92 - 42 = 50$; $_{40}Zr^{92} \implies N = 92 - 40 = 52$. (Not isotones)For option $C$: $_{38}Sr^{84} \implies N = 84 - 38 = 46$; $_{38}Sr^{86} \implies N = 86 - 38 = 48$. (Not isotones)For option $D$: $_{20}Ca^{40} \implies N = 40 - 20 = 20$; $_{16}S^{32} \implies N = 32 - 16 = 16$. (Not isotones)Therefore,the correct option is $A$.

Which of the following pairs of nuclei represents isotones?

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